[cliplumber] Add comments

bin/cliplumber

@@ -34,12 +34,13 @@ check_exists "$TERM_EMU" "mpv" "youtube-dl" &&
     opts="$(printf "audio-search\n%s" "$opts")"
 check_exists "dragon" &&
     opts="$(printf "drag-n-drop\n%s" "$opts")"
-# TODO: check requirements
+# Enable additional features when the clipboard contains an URL
 if [ -n "$urls" ] && check_exists "youtube-dl"; then
     check_exists "mpv" &&
         opts="$(printf "play\n%s" "$opts")"
     opts="$(printf "download\n%s" "$opts")"
 fi
+# Load default choice last
 check_exists "qrencode" "feh" &&
     opts="$(printf "qr\n%s" "$opts")"